Rollup merge of #68072 - JohnTitor:fix-macro-ice, r=petrochenkov

Fix ICE #68058

Fixes #68058

r? @petrochenkov

src/librustc_ast_lowering/expr.rs

@@ -202,7 +202,12 @@ pub(super) fn lower_expr_mut(&mut self, e: &Expr) -> hir::Expr<'hir> {
             ExprKind::Mac(_) => panic!("Shouldn't exist here"),
         };
 
-        hir::Expr { hir_id: self.lower_node_id(e.id), kind, span: e.span, attrs: e.attrs.clone() }
+        hir::Expr {
+            hir_id: self.lower_node_id(e.id),
+            kind,
+            span: e.span,
+            attrs: e.attrs.iter().map(|a| self.lower_attr(a)).collect::<Vec<_>>().into(),
+        }
     }
 
     fn lower_unop(&mut self, u: UnOp) -> hir::UnOp {

src/test/ui/macros/issue-68058.rs

@@ -0,0 +1,14 @@
+// check-pass
+
+macro_rules! foo {
+    ($doc: expr) => {
+        fn f() {
+            #[doc = $doc]
+            ()
+        }
+    };
+}
+
+foo!("doc");
+
+fn main() {}